239 lines
8.6 KiB
C
239 lines
8.6 KiB
C
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// Copyright 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_PROCESS_PROCESS_H_
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#define BASE_PROCESS_PROCESS_H_
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#include "base/base_export.h"
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#include "base/macros.h"
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#include "base/process/process_handle.h"
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#include "base/time/time.h"
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#include "build/build_config.h"
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#if defined(OS_WIN)
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#include "base/win/scoped_handle.h"
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#endif
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#if defined(OS_FUCHSIA)
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#include <lib/zx/process.h>
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#endif
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#if defined(OS_MACOSX)
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#include "base/feature_list.h"
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#include "base/process/port_provider_mac.h"
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#endif
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namespace base {
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#if defined(OS_MACOSX)
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extern const Feature kMacAllowBackgroundingProcesses;
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#endif
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// Provides a move-only encapsulation of a process.
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//
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// This object is not tied to the lifetime of the underlying process: the
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// process may be killed and this object may still around, and it will still
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// claim to be valid. The actual behavior in that case is OS dependent like so:
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//
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// Windows: The underlying ProcessHandle will be valid after the process dies
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// and can be used to gather some information about that process, but most
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// methods will obviously fail.
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//
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// POSIX: The underlying ProcessHandle is not guaranteed to remain valid after
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// the process dies, and it may be reused by the system, which means that it may
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// end up pointing to the wrong process.
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class BASE_EXPORT Process {
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public:
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// On Windows, this takes ownership of |handle|. On POSIX, this does not take
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// ownership of |handle|.
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explicit Process(ProcessHandle handle = kNullProcessHandle);
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Process(Process&& other);
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// The destructor does not terminate the process.
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~Process();
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Process& operator=(Process&& other);
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// Returns an object for the current process.
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static Process Current();
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// Returns a Process for the given |pid|.
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static Process Open(ProcessId pid);
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// Returns a Process for the given |pid|. On Windows the handle is opened
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// with more access rights and must only be used by trusted code (can read the
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// address space and duplicate handles).
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static Process OpenWithExtraPrivileges(ProcessId pid);
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#if defined(OS_WIN)
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// Returns a Process for the given |pid|, using some |desired_access|.
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// See ::OpenProcess documentation for valid |desired_access|.
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static Process OpenWithAccess(ProcessId pid, DWORD desired_access);
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#endif
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// Creates an object from a |handle| owned by someone else.
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// Don't use this for new code. It is only intended to ease the migration to
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// a strict ownership model.
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// TODO(rvargas) crbug.com/417532: Remove this code.
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static Process DeprecatedGetProcessFromHandle(ProcessHandle handle);
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// Returns true if processes can be backgrounded.
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static bool CanBackgroundProcesses();
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// Terminates the current process immediately with |exit_code|.
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[[noreturn]] static void TerminateCurrentProcessImmediately(int exit_code);
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// Returns true if this objects represents a valid process.
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bool IsValid() const;
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// Returns a handle for this process. There is no guarantee about when that
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// handle becomes invalid because this object retains ownership.
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ProcessHandle Handle() const;
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// Returns a second object that represents this process.
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Process Duplicate() const;
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// Get the PID for this process.
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ProcessId Pid() const;
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#if !defined(OS_ANDROID)
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// Get the creation time for this process. Since the Pid can be reused after a
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// process dies, it is useful to use both the Pid and the creation time to
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// uniquely identify a process.
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//
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// Not available on Android because /proc/stat/ cannot be accessed on O+.
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// https://issuetracker.google.com/issues/37140047
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Time CreationTime() const;
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#endif // !defined(OS_ANDROID)
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// Returns true if this process is the current process.
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bool is_current() const;
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// Close the process handle. This will not terminate the process.
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void Close();
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// Returns true if this process is still running. This is only safe on Windows
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// (and maybe Fuchsia?), because the ProcessHandle will keep the zombie
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// process information available until itself has been released. But on Posix,
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// the OS may reuse the ProcessId.
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#if defined(OS_WIN)
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bool IsRunning() const {
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return !WaitForExitWithTimeout(base::TimeDelta(), nullptr);
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}
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#endif
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// Terminates the process with extreme prejudice. The given |exit_code| will
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// be the exit code of the process. If |wait| is true, this method will wait
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// for up to one minute for the process to actually terminate.
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// Returns true if the process terminates within the allowed time.
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// NOTE: On POSIX |exit_code| is ignored.
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bool Terminate(int exit_code, bool wait) const;
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#if defined(OS_WIN)
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enum class WaitExitStatus {
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PROCESS_EXITED,
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STOP_EVENT_SIGNALED,
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FAILED,
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};
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// Waits for the process to exit, or the specified |stop_event_handle| to be
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// set. Returns value indicating which event was set. The given |exit_code|
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// will be the exit code of the process.
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WaitExitStatus WaitForExitOrEvent(
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const base::win::ScopedHandle& stop_event_handle,
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int* exit_code) const;
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#endif // OS_WIN
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// Waits for the process to exit. Returns true on success.
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// On POSIX, if the process has been signaled then |exit_code| is set to -1.
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// On Linux this must be a child process, however on Mac and Windows it can be
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// any process.
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// NOTE: |exit_code| is optional, nullptr can be passed if the exit code is
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// not required.
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bool WaitForExit(int* exit_code) const;
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// Same as WaitForExit() but only waits for up to |timeout|.
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// NOTE: |exit_code| is optional, nullptr can be passed if the exit code
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// is not required.
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bool WaitForExitWithTimeout(TimeDelta timeout, int* exit_code) const;
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// Indicates that the process has exited with the specified |exit_code|.
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// This should be called if process exit is observed outside of this class.
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// (i.e. Not because Terminate or WaitForExit, above, was called.)
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// Note that nothing prevents this being called multiple times for a dead
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// process though that should be avoided.
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void Exited(int exit_code) const;
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#if defined(OS_MACOSX)
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// The Mac needs a Mach port in order to manipulate a process's priority,
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// and there's no good way to get that from base given the pid. These Mac
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// variants of the IsProcessBackgrounded and SetProcessBackgrounded API take
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// a port provider for this reason. See crbug.com/460102
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//
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// A process is backgrounded when its task priority is
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// |TASK_BACKGROUND_APPLICATION|.
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//
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// Returns true if the port_provider can locate a task port for the process
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// and it is backgrounded. If port_provider is null, returns false.
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bool IsProcessBackgrounded(PortProvider* port_provider) const;
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// Set the process as backgrounded. If value is
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// true, the priority of the associated task will be set to
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// TASK_BACKGROUND_APPLICATION. If value is false, the
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// priority of the process will be set to TASK_FOREGROUND_APPLICATION.
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//
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// Returns true if the priority was changed, false otherwise. If
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// |port_provider| is null, this is a no-op and it returns false.
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bool SetProcessBackgrounded(PortProvider* port_provider, bool value);
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#else
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// A process is backgrounded when it's priority is lower than normal.
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// Return true if this process is backgrounded, false otherwise.
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bool IsProcessBackgrounded() const;
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// Set a process as backgrounded. If value is true, the priority of the
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// process will be lowered. If value is false, the priority of the process
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// will be made "normal" - equivalent to default process priority.
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// Returns true if the priority was changed, false otherwise.
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bool SetProcessBackgrounded(bool value);
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#endif // defined(OS_MACOSX)
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// Returns an integer representing the priority of a process. The meaning
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// of this value is OS dependent.
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int GetPriority() const;
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#if defined(OS_CHROMEOS)
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// Get the PID in its PID namespace.
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// If the process is not in a PID namespace or /proc/<pid>/status does not
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// report NSpid, kNullProcessId is returned.
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ProcessId GetPidInNamespace() const;
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#endif
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private:
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#if defined(OS_WIN)
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win::ScopedHandle process_;
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#elif defined(OS_FUCHSIA)
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zx::process process_;
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#else
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ProcessHandle process_;
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#endif
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#if defined(OS_WIN) || defined(OS_FUCHSIA)
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bool is_current_process_;
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#endif
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DISALLOW_COPY_AND_ASSIGN(Process);
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};
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#if defined(OS_CHROMEOS)
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// Exposed for testing.
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// Given the contents of the /proc/<pid>/cgroup file, determine whether the
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// process is backgrounded or not.
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BASE_EXPORT bool IsProcessBackgroundedCGroup(
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const StringPiece& cgroup_contents);
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#endif // defined(OS_CHROMEOS)
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} // namespace base
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#endif // BASE_PROCESS_PROCESS_H_
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